The American Heritage (Fla.) High School standout selected the Volunteers over finalists Georgia and LSU. Johnson ranks by Scout as the No. 107 wideout in the nation.
The 6-foot-2, 171-pounder told InsideTennessee that the Big Orange is "definitely headed in the right direction." Johnson attended the Orange Carpet Day event on Rocky Top in late June.
At The Opening Miami back on Feb. 28, Johnson did not record a 40-yard dash time but clocked a 4.35-second shuttle time.
Johnson joins fellow Tennessee receiver commits and three-stars Jeff George of Dodge City (Kan.) Community College and three-star Corey Henderson of Evangel Christian (La.) Academy with athlete TaDarryl Marshall possibly landing on the offensive side.
The future Vol helped American Heritage claim the 2014 FHSAA Class 5A state championship, catching a 7-yard touchdown in the final.